SU1237316A1 - Composite tool - Google Patents

Description

one

The invention relates to metal cutting, in particular, to machining precise holes.

The purpose of the invention is to improve processing accuracy.

Figure 1 shows schematically a combined instrument; Fig.2 fastening the cutter to the elastic holder.

The combined tool comprises a housing 1, on the outer cylindrical surface of which a movable sleeve 2, which is rigidly fixed on the pin 3, progressively moves,

8 inclined groove. The movable sleeve is placed cutting element 4, mounted on an elastic holder 5, formed in the form of a leaf spring. The holder is located in the longitudinal groove of the hinge and is attached at one end to it with the help of screw 6. Inside the case there is a correction 8 connected to the power actuator piston (not shown) and spring loaded with a set of disc springs 7. Adjustment differential screw

9 connects the mandrel with a pin, thereby ensuring the transfer of translational motion of the mandrel to the movable sleeve. By rotating the adjusting screw, the pins 3 and, hence, the movable sleeve 2 are progressively moved relative to the mandrel 8, which allows adjustment and subsequent adjustment of the cutting element 4.

in the given size. In the conical slots of the housing, cutting elements 10 of adjustable sweep are installed, fixed by a nut 11 and a lock nut 12, and in front are wedges with screws 13.

The tool works as follows.

Using the adjusting differential screw 6, moving in the axial direction the pin 3 with the sleeve 2 fixed on it, adjust the cutting element 4 to the calculated diameter of the opening part of the hole. At the same time, the mandrel 8 is prevented from moving by the set of disc springs 7. Using a nut 11, after having loosened the lock nut 12 and screws 13, the adjustable sweep elements 10 are adjusted to the calculated diameter of the hole.

After a fast supply of the device to the workpiece, a fine spread is made.

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cutting of the lead-in part of the hole with characteristic cutting conditions. Upon reaching the calculated machining depth, a command is issued to the power tool, moving the mandrel 8 to the left until the pin 3 surface stops against the end of the transverse groove of the body. When this cutting element 4 under the action of the translational-movable sleeve 2

10 will move away from the machined surface and completely drown in the inclined groove B of the movable sleeve.

Prior to the beginning of the incision of the cutting elements 10, a command is issued to change the cutting conditions of the applicator, but to a clean deployment, after which the deployment is carried out along the entire length of the hole being machined. At the end of the treatment, a rapid removal of the device from the workpiece follows, a command is given to the power drive and, under the action of a set of cup springs, the mandrel 8 moves to the right until it stops at the end surface

25 V mandrel travel restraint.

The geometrical parameters of the plate spring S and L, where S is the spring thickness, Lg is the spring length, are selected so that the workers arising during the cutting process

the loads, before all the cutting forces, did not cause elastic deformations of the spring. .

When moving the sleeve 2 progressively, a force P arises, causing the cutting member .4 to be pressed against the surface of the inclined groove. At. This clamping force P is decomposed into two components: normal (N) and directed along the tool (R.). The component P can be considered as the thrust force of the elastic holder 5, which is necessary to drown the cutting element 4 in the inclined groove of the sleeve. The condition under which seizure does not occur is determined as follows:

R. F

{tr

35

40

45

50

where F is the strength of friction. Of mechanics

P, P s.Inod, FTP k-N k.P.cos to,,

where ui. - the angle of the groove of the sleeve; k is the coefficient of friction between the materials of the contact pair: sleeve: elastic holder (cutting element).

In this way,

R . sin about k P-COS oi. From here

tg l k

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those. The condition for the normal operation of the contact pair: the sleeve - the elastic holder (cutting element) is to observe the inequality tg .: k.

five

Editor M. Bandura

Compiled by G. Sirotovsk

Tehred L.Oleynik Proofreader L.Pilipenko

Order 3229/12 Circulation 1001 Subscription

VNIIPY USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

Claims (1)

COMBINED TOOL, in the housing of which there is a sleeve with a pin fixed on it, connected to a spring-loaded mandrel, installed in the sleeve with the possibility. radial movement of the cutter and the associated end cutting tool, characterized in that, in order to increase accuracy, the device is equipped with an elastic holder, at the end of which the said cutter is mounted, placed in a longitudinal groove made in the housing, and connected to the mandrel by a screw installed with the ability to move and associated with the pin, and in the sleeve is made an inclined groove to accommodate the cutter. SU ,, 1237316 * 1